Neck up question. 6.5 to 30cal.

[DngBat7]

I will soon be doing a 30 Major. Question is, to go from 6.5 Grendel brass to .30 cal. Pma has a 6 to 30 neck up mandrel. 21 century has a 6 to 7mm, 7 to 30 cal. So it would require 2 steps. Is that to relax the brass some how so the necks don’t split or is it ok to do it one step which I prefer.

 

[pikespeakgoat]

I've done a many 6br to 30 br in just one step w/o issue.

Make sure to use plenty lube.

 

[DngBat7]

Thank you

 

[Dusty Stevens]

K&m makes a mandrel just for going from 6-30. That same mandrel called an expandiron will be perfect. No need for 2 steps

 

[Boatschool02]

Depends whose turning arbor you'll be using.
The PMA expander that goes all the way to 30 is optimized for this one step process and is a mated pair with their turning arbor.
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That being said, I get more consistent results when necking up in multiple steps... but I'm no pro.

 

[Bill Norris]

While necking up my 6mmBR brass to 30BR I did it step up method. I only lost 1 pc of brass. I did lube all cases each step up.

 

[Cecil S.]

Redding graphite lube may help. Less clean up.

 

[rjtfroggy]

Dan don't buy anything, You can borrow mine, 6-30 graduated.

 

[DngBat7]

Thanks everyone. Appreciate the responses

 

[rogn]

If you have any problems , you might want to consider annealing.

 

[DJSBRS]

Even though you can use one mandrel to go from 6mm to .30 caliber, I do not recommend it due to the shoulders tend to warp due to all the down pressure and the necks will not be concentric to the body. If you decide to do so, after necking up, you may want to full length resize the now formed 30BR and run the correct expanding sizing mandrel back through that matches your neck turner for proper clearance prior to turning necks for consistent run out and chamber clearance.

DJ
DJ's Brass Service
205-461-4680

 

[TrxR]

How many steps do you recommend ? And whos expanders do you use? also what lube do you use for this?

Im currently using a PMA 6-30 but had to run everything through a sizing die afterwards . thinking about adding a step or 2.

Even though you can use one mandrel to go from 6mm to .30 caliber, I do not recommend it due to the shoulders tend to warp due to all the down pressure and the necks will not be concentric to the body. If you decide to do so, after necking up, you may want to full length resize the now formed 30BR and run the correct expanding sizing mandrel back through that matches your neck turner for proper clearance prior to turning necks for consistent run out and chamber clearance.

DJ
DJ's Brass Service
205-461-4680

 

[DJSBRS]

How many steps do you recommend ? And whos expanders do you use? also what lube do you use for this?

Im currently using a PMA 6-30 but had to run everything through a sizing die afterwards . thinking about adding a step or 2.

I use Hornady elliptical expanders starting with .257,.264,.284 and .30. Then I use a 30 cal expanding mandrel that matches up with the neck turner I plan on using. I use Hornady One Shot case lube for expanding.

 

[TrxR]

I use Hornady elliptical expanders starting with .257,.264,.284 and .30. Then I use a 30 cal expanding mandrel that matches up with the neck turner I plan on using. I use Hornady One Shot case lube for expanding.

Im assuming these can only be used in a Hornady die? Which die are you using them in?

 

[DJSBRS]

Hornady neck sizing only dies.

DJ

 

[JimSC]

I recently did 100 new Starline from 6.5 grendel to 30 Major, lost 1 I think. One step with a steel Sinclair expander, I used Imperial for lube.